Tiny tigers face swim test

A 3-month-old Sumatran tiger cub named "Bandar" shows his displeasure after being dunked in the tiger exhibit moat for a swim reliability test at the National Zoo in Washington, Nov. 6, 2013.

All cubs born at the zoo must take a swim test before being allowed to roam in the exhibit. Bandar passed his test.

Credit: Manuel Balce Ceneta/AP

A female Sumatran Tiger cub named Sukacita is lifted by biologist Leigh Pitsko (R) after the cub performed her "swim test" in a moat of the Great Cats exhibit at the National Zoo, Nov. 6, 2013.

Sukacita is one of two Sumatran Tigers born Aug. 5, 2013. The cubs must be able to keep their heads above water, navigate the shallow end of the moat, and have the strength and agility to climb onto dry land on their own.

Credit: Win McNamee/Getty Images

Sukacita is lowered into the tiger exhibit moat for a swim reliability test at the National Zoo, Nov. 6, 2013.